<template>
  <div>
    <div class="search">
      <input type="text" v-model="keyword" class="search-input" placeholder="输入城市名或拼音">
    </div>
    <div class="search-content" ref="search" v-show="keyword">
      <!--双向绑定keyword-->
      <ul>
        <!--遍历找到的城市-->
        <li class="search-item border-bottom" v-for="(item,index) in list" :key="index" @click="handleCityClick(item.name)">{{item.name}}</li>
        <!--没有找到时的显示-->
        <li class="search-item border-bottom" v-show="hasNoData">
          没有找到匹配数据
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import {mapMutations} from 'vuex'
export default {
  name: 'CitySearch',
  props: {
    cities: Object
  },
  data () {
    return {
      keyword: '',
      list: [],
      timer: null,
      scroll: null
    }
  },
  computed: {
    hasNoData () {
      return !this.list.length
    }
  },
  watch: {
    keyword () {
      if (this.timer) {
        clearTimeout(this.timer)
      }
      if (!this.keyword) {
        this.list = []
        return
      }
      this.timer = setTimeout(() => {
        const result = []
        for (let i in this.cities) {
          this.cities[i].forEach((value) => {
            if (value.spell.indexOf(this.keyword) > -1 ||
              value.name.indexOf(this.keyword) > -1) {
              result.push(value)
            }
          })
        }
        this.list = result
      }, 100)
    }
  },
  methods: {
    handleCityClick (city) {
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  mounted () {
    if (this.scroll === null) {
      this.scroll = new Bscroll(this.$refs.search, {
        preventDefault: false,
        click: true,
        scrollY: true
      })
    } else {
      this.scroll.refresh()
    }
  }
}
</script>

<style lang="stylus" scoped>
@import '~$styles/variables.styl'
 .search
    height .72rem
    padding 0 .1rem
    background $bgColor
    .search-input
      padding 0 .1rem
      box-sizing border-box
      height .62rem
      line-height .62rem
      width 100%
      text-align center
      border-radius .06rem
.search-content
  background #eee
  position absolute
  top 1.58rem
  left 0
  right 0
  z-index: 1
  bottom 0
  overflow: scroll
  -webkit-overflow-scrolling: touch /* ios 平滑滚动*/
  overflow-scrolling: touch
  -webkit-transform: translate3d(0,0,0) /* android 平滑滚动*/
  transform: translate3d(0,0,0)
  .search-item
    line-height .62rem
    padding-left .2rem
    color #666
    background #fff
</style>
